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ENVIRONMENTAL MATTERS (Tables) | 12 Months Ended
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Dec. 31, 2019
Environmental Matters [Abstract] |
Schedule of Environmental Liabilities, Current and Non-current |
(Dollars in millions) | December 31,
| 2019 |  | 2018
Environmental contingent liabilities, current | $ | 20 |  |  | $ | 25 |
Environmental contingent liabilities, long-term | 267 |  |  | 271 |
Total | $ | 287 |  |  | $ | 296 |
Schedule of Changes to Environmental Remediation Liabilities |
(Dollars in millions) | Environmental Remediation Liabilities
Balance at December 31, 2017 | $ | 280 |
Changes in estimates recognized in earnings and other | 7 |
Cash reductions | (16 | )
Balance at December 31, 2018 | 271 |
Changes in estimates recognized in earnings and other | 4 |
Cash reductions | (15 | )
Balance at December 31, 2019 | $ | 260 |

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